cylindrical coordinates

noun (used with a plural verb) Mathematics.
a system of coordinates for locating a point in space by its polar coordinates and its perpendicular distance to the polar plane.

1930–35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cylindrical coordinates
pl n
three coordinates defining the location of a point in three-dimensional space in terms of its polar coordinates (r, θ) in one plane, usually the (x, y) plane, and its perpendicular distance, z, measured from this plane

Collins English Dictionary - Complete & Unabridged 10th Edition
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